Custom Linked List: Implement your own linked list class to manage patient data dynamically.

$2.$ User Menu: Implement a menu with options to:

$$ Insert a new patient into the waiting list.

$$ Delete a patient from a specified position in the waiting list.

$$ Re$-$rank a patient within the waiting list based on urgency criteria.

$$ Search for a patient by name.

$$ Display the total number of patients in the waiting list.

$$ Exit the application.

$3.$ User Authentication: Before using the patient manager, prompt the user for a username and

password. The application should only exit upon entering the correct password.

$4.$ Re$-$ranking Mechanism: Based on criteria such as blood pressure, BMI, and waiting time,

implement a feature to adjust the ranking of patients in the waiting list.

$5.$ Robustness: The application should handle invalid inputs gracefully and maintain a loop until the

user chooses to exit with the correct password.

$6.$ Deletion and Insertion: Ensure these operations are intuitive and validate user inputs to prevent

errors